I just watched "Food, Inc" this weekend, it's a very well made documentary. Much more evidence-based and non-preachy than I expected.

They talk at length about what they call 'veggie libel laws' and other laws introduced by food producer lobbies that limit free speech and surveillance about food productions. There's a long history of this, unfortunately it's nothing new.

If you have amazon prime, you can watch it for free: http://www.amazon.com/Food-Inc/dp/B002VRZEYM/ref=sr_1_1?ie=U...